Solid phase microextraction device, repository, and manipulator

ABSTRACT

A solid phase microextraction device is disclosed, including a substrate having at least one planar surface, a sorbent layer disposed on at least a portion of the at least one planar surface, a tapering tip extending from the substrate, a receptacle mount configured for removable attachment to an emplacement of a receiving device, and a clocking feature configured for fixing a radial orientation of the at least one planar surface with respect to the receiving device. A solid phase microextraction device repository is disclosed including a wall surrounding a chamber, a plurality of orifices disposed in the wall configured to receive and retain the device, and a plurality of clocking feature interfaces disposed in the wall. A solid phase microextraction device manipulator is disclosed, including a manipulator shaft, an emplacement configured to removably engage a receptacle mount, an electrically conductive contact disposed at the emplacement, an ejector, and a clocking feature interface.

RELATED APPLICATIONS

This application claims the benefit of and priority to U.S. Prov. App.No. 62/889,271, filed Aug. 20, 2019, entitled “Radially Oriented Devicefor Storing and Dispensing Analyte Collection Devices,” which is herebyincorporated by reference in its entirety.

FIELD OF THE INVENTION

This application is directed to solid phase microextraction devices,solid phase microextraction device repositories, and solid phasemicroextraction device manipulators. In particular, this application isdirected to solid phase microextraction devices, solid phasemicroextraction device repositories, and solid phase microextractiondevice manipulators including clocking features and clocking featureinterfaces.

BACKGROUND OF THE INVENTION

Coated Blade Devices

Coated Blade Spray (CBS) is a solid phase microextraction (SPME)-basedanalytical technology previously described in the literature (Pawliszynet al.; U.S. Pat. No. 9,733,234) that facilitates collection of analytesof interest from a sample and the subsequent direct interface to massspectrometry systems via a substrate spray event (i.e., electrosprayionization).

“Coated blade spray,” “CBS blade”, and “blade device” are usedsynonymously herein.

There are two basic stages to CBS-based chemical analysis: (1) analytecollection followed by (2) instrumental analysis. Analyte collection isperformed by immersing the sorbent-coated end of the blade devicedirectly into the sample. For liquid samples, the extraction step isgenerally performed with the sample contained in a vial or well plate.

After analyte collection, the blade device is removed from the sampleand, following a series of rinsing steps, the blade device is thenpresented to the inlet of the mass spectrometer (MS) for analysis. Inthis fashion, the blade device undergoes several transfer steps.Reliable positioning of the blade device for each of these steps istherefore important, both for manual and robotic automation handlingcircumstances.

As a direct to MS chemical analysis device, the blade device requires apre-wetting of the extraction material so as to release the collectedanalytes and facilitate the electrospray ionization process.Subsequently, a differential potential is applied between the non-coatedarea of the substrate and the inlet of the MS system, generating anelectrospray at the tip of the CBS device. The electric field betweenthe blade and the MS system must be reproducibly created in order toensure reliable run-to-run precision. Proper positioning of the bladedevice with respect to the MS skimmer cone opening is therefore veryimportant, including the radial (or rotational) orientation of the bladedevice.

In general, the blade portion of a blade device has two sides, an upperand a lower. In some cases, different sorbent coatings may be present oneach of the flat sides of the blade, and two sample analyses may betherefore performed in sequence; first the analysis of the upper side,followed by a second analysis of the lower. In other examples, samesorbent coating may be present on each of the flat sides of the blade,and a two sample analyses may be therefore performed in sequence, but indifferent instruments: first the analysis of the upper side oninstrument A, followed by a second analysis of the lower on instrumentB. In either case, the radial orientation of the blade is also critical.

Previous disclosures describe either manually handling the individualblade devices to properly position them with respect to the entrance tothe mass spectrometer. Other examples describe one- and two-dimensionalarrays of blade devices in a bulk holder. These embodiments include arigid support capable of housing more than one blade device. Examples ofthis arrangement include U.S. Pat. No. 7,259,019. These examples aregenerally aligned to the standard laboratory sampling plasticware, mostcommonly microtiter trays having an 8×12 well arrangements, the wellshaving approximately 9 mm centers. Higher density trays are alsocommercially available, having smaller sample wells positioned evencloser together, in order to maintain the standard sample trayfootprint.

Because of the single inlet to the MS device, the sample analysis stageis still a serial process when using these array-based designs. Aselected blade device within the greater array is positioned forelectrospray ionization. This design has the disadvantage of alsopositioning the entire array of blade devices in the general proximityof the MS, which creates considerable risk of electrical and/or chemicalcross talk between adjacent blade devices during the electrosprayionization processes. This in turn particularly undermineschain-of-custody sample analysis applications, such as clinical orforensic screening of biological fluids.

There is therefore a need for automated handling of CBS devices, wherethe close position array arrangement is maintained during the sampleextraction processes using standard microtiter trays, and whereindividual blade devices are introduced to the ionization region of themass spectrometer. The invention disclosed here addresses the additionalrequirement of radial positioning of the blade during the entiresampling-to-analysis process.

Description of a Micro Pipettor Device

A common tool in laboratories for transporting accurate volumes ofliquid is a micropipettor. Examples of this arrangement include U.S.Pat. Nos. 4,284,604, 5,650,124, and 7,421,913. Micropipettors employ avariety of mechanisms to pull liquid volumes into the device andsubsequently dispense the liquid. Precision volume capacities forstandard pipettors range from 0.1 μL to 10 mL. In order to reduce therisk of sample contamination, disposable pipette tips are employed. Themicropipette tips are mounted onto the pipettor by pushing the pipettorinto the tip, and friction maintains the tip in place. After the liquidhas been dispensed, the tip is ejected off the end of the pipettor, andthe entire process is repeated.

In cases where many liquid transfer steps are performed for highlyparallel processes, micropipettor devices employing more than one liquiddispensing channel are available. Examples of this arrangement includeU.S. Pat. No. 5,021,217. These devices still employ the friction fitattachment mechanism of the disposable tips.

For clarity, the terms “pipette,” “pipettor,” “micropipettor,” and“multichannel pipettor” are used herein synonymously. The terms “pipettetip” and “micropipette tip” are also used synonymously.

Equivalent liquid volumes are drawn and delivered for each tip. Tipposition in the pipettor array aligns with the tip positions in storageracks for ease of installation.

Multichannel pipette devices are used with pipette tips in 1- and2-dimentioanal array storage racks, so a row of disposable tips can bemounted in parallel into the micropipettor.

Micropipettor technology has also been adapter to robotic systems, wherethe entire liquid transfer sequence is the same as employed for themanual units but is automated.

Because of the ubiquitous presence of micropipettors in laboratories,both for manual use and integrated into robotic automation setups,maintaining compatibility with the CBS device to the physical dimensionsof micropipettor technology is advantageous.

Micropipette Tips

Because many applications that employ micropipettors are sensitive tochemical contamination, disposable, single use pipette tips areavailable. Standard micropipette tips are loaded onto the pipettordevice by centering the device over the docked tip and tapping thedevice gently onto the opening of the tip. The tip is mounted viafriction and is ready for use. Following use, the dirty microtiter tipis removed from the device by means of a tip ejector, typically aslidable sheath around the shaft of the device that engages with theupper lip of the disposable tip and pushes to overcome the frictionconnection. An example of a pipette tip that has been modified forsample extraction includes U.S. Pat. No. 7,595,026.

Common micropipette tips are conical and do not have a radialorientation requirement for normal operation.

Conductive tips are used to prevent carryover in automated pipettingrobots. An example of a conductive tip is the addition of graphite tothe raw material polypropylene makes the pipette tips electricallyconductive and gives the tips an opaque black appearance. Alternativeembodiments where a portion of the pipette tip is conductive aredescribed in U.S. Pat. No. 9,346,045. The relative position of the tipswithin robotic workstations is identified by measuring electriccapacitance. The filling level of the liquid in the tip can bedetermined in sample and reagent containers by measuring electriccurrents, so that the depth of immersion of the tip can be adjusted tothe filling level.

Because of the frequent tip replacement in standard sampling handlingpractices, multiple tips are stored in racks where the tips areprotected from environmental contamination. In keeping with the arrayposition standards described earlier, bulk storage of disposable tipscommonly employs the 8×12, 96 tip arrays or multiples of 96 tips withthe standard tip center-to-center position. This allows for directloading into multichannel pipette devices and maintains the standardrack footprint in laboratories and on the automation workstationplatforms.

Rack containers for housing micropipette tips do not include elements tomaintain the radial orientations of the standard pipette tips.

BRIEF DESCRIPTION OF THE INVENTION

In one exemplary embodiment, a solid phase microextraction deviceincludes a substrate having at least one planar surface, a sorbent layerdisposed on at least a portion of the at least one planar surface, atapering tip extending from the substrate, a receptacle mount configuredfor removable attachment to an emplacement of a receiving device, and aclocking feature configured for fixing a radial orientation of theplanar surface with respect to the receiving device.

In another exemplary embodiment, a solid phase microextraction devicerepository includes a repository wall surrounding and defining achamber, a plurality of orifices disposed in the repository wall, eachconfigured to receive and retain a substrate and a receptacle mount of asolid phase microextraction device, and a plurality of clocking featureinterfaces disposed in the repository wall, each configured to guide aclocking feature of the solid phase microextraction device into apredetermined radial orientation and fix the solid phase microextractiondevice in the predetermined radial orientation. The chamber isconfigured to accept the substrate of the solid phase microextractiondevice with the substrate and a tapering tip extending from thesubstrate being remote from contact with the repository wall or anyadjacent solid phase microextraction devices disposed in the solid phasemicroextraction device repository.

In another exemplary embodiment, a solid phase microextraction device asolid phase microextraction device manipulator includes a manipulatorshaft, an emplacement disposed at an end of the shaft, the emplacementbeing a pipettor tip emplacement configured to removably engage apipette tip receptacle mount of a solid phase microextraction device, anelectrically conductive contact disposed at the emplacement such thatwhen the pipette tip receptacle mount of the solid phase microextractiondevice is mounted to the emplacement, the electrically conductivecontact is in electrical communication with an electrically conductiveterminal of the pipette tip receptacle mount, an ejector configured todismount the pipette tip receptacle mount from the emplacement, and aclocking feature interface configured to guide a clocking feature of thesolid phase microextraction device into a predetermined radialorientation and fix the solid phase microextraction device in thepredetermined radial orientation.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates the relevant mechanical elements of a commerciallyavailable micropipettor and disposable pipette tip.

FIGS. 2(a) and (b) illustrate a solid phase microextraction deviceintegrated with the connection elements to interface with a commerciallyavailable micropipettor, according to an embodiment of the presentdisclosure.

FIGS. 3(a) and (b) illustrate a solid phase microextraction devicehaving fin elements for control of radial orientation while housed in astorage container, according to an embodiment of the present disclosure.

FIG. 4 illustrates a solid phase microextraction device repository withthree examples of mechanical elements to promote control of the radialorientation of a solid phase microextraction device having fin elements,according to an embodiment of the present disclosure.

FIG. 5 illustrates three examples of the solid phase microextractiondevice repository with properly docked solid phase microextractiondevices having fin elements, according to an embodiment of the presentdisclosure.

FIG. 6 illustrates a solid phase microextraction device havingmicropipettor connection elements with an integrated electrode surfaceinside the connection element for the application of a voltage to thesolid phase microextraction device, according to an embodiment of thepresent disclosure.

FIG. 7 illustrates a micropipettor modified to provide electricalcommunication with a solid phase microextraction device having anintegrated electrode, according to an embodiment of the presentdisclosure.

FIG. 8 illustrates a solid phase microextraction device havingmicropipettor connection elements with an integrated electrode residentinside the connection element for the application of a voltage to theblade device, according to an embodiment of the present disclosure.

FIG. 9 illustrates a solid phase microextraction device havingmicropipettor connection elements with two slots positioned around theconnection element to control of the radial orientation of a solid phasemicroextraction device to one of two positions, according to anembodiment of the present disclosure.

FIG. 10 illustrates the installation of a solid phase microextractiondevice with two slots into a modified pipettor having equivalentfeatures to orient the solid phase microextraction device to one of twopossible positions while installed in the pipettor with the pipettoralso being modified to provide electrical communication with a solidphase microextraction device, according to an embodiment of the presentdisclosure.

FIG. 11 illustrates a solid phase microextraction device havingmicropipettor connection elements with three slots and an integratedelectrode, the three slots positioned asymmetrically around theconnection element to control of the radial orientation of a solid phasemicroextraction device to one position, according to an embodiment ofthe present disclosure.

FIG. 12 illustrates the installation of a solid phase microextractiondevice with three slots into a modified pipettor having equivalentfeatures to orient the solid phase microextraction device to onepossible position while installed in the pipettor, the pipettor alsobeing modified to provide electrical communication with a solid phasemicroextraction device, according to an embodiment of the presentdisclosure.

FIG. 13(a) illustrates a solid phase microextraction device havingmicropipettor connection elements with two hollow protrusions positionedaround the connection element to control of the radial orientation of asolid phase microextraction device to one of two possible positions,according to an embodiment of the present disclosure.

FIG. 13(b) illustrates a solid phase microextraction device havingmicropipettor connection elements with three hollow protrusionspositioned asymmetrically around the connection element to control ofthe radial orientation of a solid phase microextraction device to oneposition, according to an embodiment of the present disclosure.

Wherever possible, the same reference numbers will be used throughoutthe drawings to represent the same parts.

DETAILED DESCRIPTION OF THE INVENTION

To date, no microscale sampling device has been adapted to themechanical elements of micropipette devices for loading and ejectingdisposable tips, with the additional requirement of radial positioning.

Because CBS blades are nominally flat strips which require a specificradial orientation when loaded into the source of the analyzer (in mostcases, a mass spectrometer), control of the radial orientation of theblade during all stages of use is desired. Disclosed are severalexamples where the radial orientation of the blade device is maintainedthroughout the sampling and analysis work flow. Examples are presentedwhere the blade device orientation is maintained while the bladesdevices are stored in bulk. Also presented are examples where the bladedevices may be interfaced with standard micropipette mechanical deviceswhile maintaining the radial orientation.

A further requirement of CBS blades is the application of a voltage biasonto the blade during spray analysis. It is desirable that the modifiedCBS blade also contains elements that permit the application of avoltage bias onto the blade as part of the device. Embodiments of theinvention described herein include the blade having a voltage biasapplied during spray analysis. Examples of the invention are discloseddepicting electrode elements as well as the use of electricallyconductive tips to apply the voltage required during sample analysis.

Disclosed herein is a solution to control the radial orientation of asolid phase microextraction device during the entire analyticalworkflow. The solution is mechanically compatible with both manual andautomation laboratory applications. This solution conforms to themechanical standards common in analytical laboratory systems, includingby direct integration with installed laboratory devices such aspipettors and bulk storage devices to promote rapid adoption of thesolid phase microextraction devices disclosed herein by laboratories.

As used herein, “about” indicates a variance of ±15% of the value beingmodified by “about,” unless otherwise indicated to the contrary.

As used herein, “solid phase microextraction” includes, but is notlimited to, a solid substrate coated with a polymeric sorbent coating,wherein the coating may include metallic particles, silica-basedparticles, metal-polymeric particles, polymeric particles, orcombinations thereof which are physically or chemically attached to thesubstrate. In some non-limiting examples, the solid substrate has atleast one depression disposed in or protrusion disposed on a surface ofthe substrate and said substrate includes at least one polymeric sorbentcoating disposed in or on the at least one depression or protrusion. Theterm “solid phase microextraction” further includes a solid substratewith at least one indentation or protrusion that contains at least onemagnetic component for the collection of magnetic particles or magneticmolecules onto the solid substrate.

FIG. 1 illustrates a common commercially available manual micropipettor100. The pipettor is a plunger displacement-based device capable offirst drawing liquid into the pipette tip 110 and subsequentlydispensing the liquid. The plunger mechanism is not shown and resides inthe housing 108 of the pipettor between the plunger shaft 102 and thepipette end 109.

Standard micropipette tips are loaded onto the pipettor device 100 bycentering the device over the tip 110 (commonly docked in a separateholder, not shown) and tapping the device 100 gently onto the opening ofthe tip 112. The tip 100 is mounted via friction against the conicalouter surface 104 of the pipette end 109 and is ready for use.

The operator first depresses the push button 101 and immerses thepipette tip 110 into the liquid of interest. Releasing the push buttondraws a volume of liquid into the vessel portion 113 of the pipette tip.The liquid is transferred by depressing the push button 101 again, andthe liquid is dispensed.

Following the desired number of liquid transfer operations, the pipettetip 110 is ejected from the pipettor by depressing the tip ejectorbutton 105. This operation pushes the tip ejector 106 down the length ofpipette shaft 103 and the bottom surface of the ejector shaft 107 pushesthe pipette tip 110 off the conical outer surface 104 of pipettor end109. The entire procedure is then repeated as required.

While the manual version of the pipette device is shown, automated androbotic versions include the same relevant mechanical elements.

The conical shape and dimensions of the pipette end 109, the bottomsurface of the ejector shaft 107, and the pipette tip cup 111 arestandardized in the art. In one embodiment, the solid phasemicroextraction devices disclosed herein are adapted to thesestandardized dimensions in order to interface easily with the installedlaboratory equipment.

Referring to FIGS. 2(a) and (b) the basic elements of a solid phasemicroextraction device 200 comprise a substrate 230 having at least oneplanar surface 235, a sorbent layer 240 disposed on at least a portionof the at least one planar surface 235, a tapering tip 245 extendingfrom the substrate 230 toward an analysis end of the solid phasemicroextraction device 200, and a receptacle mount 210 configured forremovable attachment to an emplacement 104 of a receiving device 100.The substrate 230 may have any suitable dimensions, including, but notlimited to, about 4 mm wide×about 40 mm long×about 0.5 mm thick. Thesubstrate 230 may be made from any suitable material, including, but notlimited to, conductive materials such as, but not limited to, stainlesssteels. The sorbent layer 240 may include an extraction phase sorbentincluding, but not limited to, polymeric particles (e.g., silicamodified with C₁₈ groups) and a binder (e.g., polyacrylonitrile).

In one embodiment, the solid phase microextraction device 200 is a CBSdevice that has been adapted to standard pipette tip 110 dimensions. Theblade portion 220 is fitted with a cup as the receptacle mount 210 whichis configured to attach to the emplacement 104 on the pipettor end 109.The receptacle mount 210 is fixed to the substrate 230 and is positionedat the opposite end from the sorbent layer 240 and tapering tip 245. Theinner surface 215 of the receptacle mount 210 is shaped to employ afriction fit mechanism, consistent with the standard commercial pipettetip cup 111. The receptacle mount 210 may be made from electricallyinsulating polymers consistent with standard pipette tips, such as, butnot limited to, polypropylene or electrically conductive polymers suchas, but not limited to, carbon impregnated polypropylene.

Referring to FIGS. 3(a) and (b), in one embodiment, the solid phasemicroextraction device 200 includes a clocking feature 305, which isconfigured to fix a radial orientation of the planar surface 230 withrespect to the receiving device 100. “Clocking” is intended to connotatethe passage of a hand around an analogue clockface as a paradigm forindicating radial orientation of the planar surface 230. In oneembodiment, the clocking feature 305 includes at least one of anindentation or a protrusion corresponding to at least one of acomplimentary protrusion or complimentary indentation of the receivingdevice 100, such that when the solid phase microextraction device 200 ismounted to the receiving device 100, the clocking feature 305 limits theradial orientation of the solid phase microextraction device 200 withrespect to the receiving device 100 to a predetermined number of radialpositions. The predetermined number of radial positions may consist of asingle radial position, two radial positions, or may include anysuitable lager number of radial positions. The solid phasemicroextraction device 200 may include visual indicia of the radialorientation of the at least one planar surface 230 on the receptaclemount 210. Such visual indicia may serve to indicate the radialorientation of the at least one planar surface 230 when the planarsurface 230 itself is not visible.

In one embodiment, the solid phase microextraction device 200 is apipettor-compatible CBS device 300, the receptacle mount 210 is apipette-tip receptacle mount 210, and the emplacement 104 is a pipettortip emplacement 104 configured to removably engage the pipette tipreceptacle mount 210. As used herein, “removably” indicates removalwithout damage to the pipettor tip emplacement 104 or the pipette-tipreceptacle mount 210. The receiving device 100 may be any suitabledevice, including, but not limited to, a pipettor 100 or a solid phasemicroextraction device manipulator 700 (described below).

In a further embodiment, the pipette-tip receptacle mount 210 has twofin protrusions 310 extending equidistant from the pipette tipreceptacle mount 210 serving as the clocking feature 305. The presenceof the two fin protrusions 310 in this configuration reduces the radialposition conditions 320 of the blade to two discreet equivalentpositions (i.e., 0° and 180°). The two-fin design depicted here is forillustration purposes; other configurations employing greater or fewerfins may be used, or other features on the pipette tip receptacle mount210 may be conceived where the radial rotation of the solid phasemicroextraction device 200 is restricted when engaged with anemplacement 104. In order for the fin protrusions 310 to control radialposition they engage with the receiving device 100 in a lock-and-keyarrangement.

FIGS. 4 and 5 illustrates a solid phase microextraction devicerepository 400 which orients the solid phase microextraction device 300while it is docked. The solid phase microextraction device repository400 includes a repository wall 405 surrounding and defining a chamber401, a plurality of orifices 420 disposed in the repository wall 405,each configured to receive and retain a substrate 230 and a receptaclemount 210 of a solid phase microextraction device 200, and a pluralityof clocking feature interfaces 406 disposed in the repository wall 405,each configured to guide a clocking feature 305 of the solid phasemicroextraction device 200 into a predetermined radial orientation andfix the solid phase microextraction device 200 in the predeterminedradial orientation. The chamber 401 is configured to accept thesubstrate 230 of the solid phase microextraction device 200 with thesubstrate 230 and a tapering tip 245 extending from the substrate 230being remote from contact with the repository wall 405 or any adjacentsolid phase microextraction devices 200 disposed in the solid phasemicroextraction device repository 400. The plurality of orifices 420 maybe arranged in any suitable pattern or without pattern, including, butnot limited to, a one-dimensional array or a two-dimensional array. Theradial orientations of the individual solid phase microextractiondevices 300 docked in the solid phase microextraction device repositorymay all be the same or different as required by the sample handling andanalysis operations.

In one embodiment, the solid phase microextraction device repository 400includes two slits 410 as the clocking feature interfaces 406, radiallypositioned consistent with clocking feature 310 of the solid phasemicroextraction device 300. In a further embodiment, the taper of theblade fins 310 provides an additional mechanism to assist the successfuldocking of slightly offset solid phase microextraction devices 300 withrespect to the axial center of the tapering tip 245 and the orifices 420of the solid phase microextraction device repository 400. The blade fins310 and the corresponding clocking feature interfaces 406 may includeasymmetrical configurations so as to further limit the positioning ofthe solid phase microextraction device 300 to a single position whileengaged with the solid phase microextraction device repository 400.

In one embodiment, the clocking feature interface 406 includes guidanceprotrusions 430 surrounding the orifice 420 to promote proper alignmentof solid phase microextraction devices 300 when they are docked into thesolid phase microextraction device repository 400. If the solid phasemicroextraction device 300 is radially off axis with respect to theorientation of the clocking feature 310 to the clocking featureinterface 406, the guidance protrusions 430 are tapered to a point 432and join to create a valley shape 435 at the base of the orifice 420.The taper of the guidance protrusions 430 provides a mechanism to guideand realign an off-axis solid phase microextraction device 300 so thatit is properly positioned while docked in the solid phasemicroextraction device repository 400.

The orientation of the solid phase microextraction device 300 in thesolid phase microextraction device repository 400 may be configured toremain consistent with the positioning requirements of either a manualoperator or automated usage. FIG. 5 illustrates three possible, but notexclusive, arrangements of the solid phase microextraction device 300docked in solid phase microextraction device repository 400. The chamber401 of the solid phase microextraction device repository 400 may beconfigured so as to ensure that individual solid phase microextractiondevices 300 are not in contact with the repository wall 405 or eachother. Additional wall or barrier structures (not shown) may also beemployed in the solid phase microextraction device repository 400 toensure solid phase microextraction device integrity.

Referring to FIG. 6 , in one embodiment, an electrically conductivesolid phase microextraction device 600 includes a substrate 230 havingan electrically conductive portion 605. The receptacle mount 210includes an electrically conductive terminal 616 disposed on an innersurface 215 of the receptacle mount 210 configured to be in electricalcommunication with the emplacement 104 of the receiving device 100 whenthe electrically conductive solid phase microextraction device 600 ismounted to the receiving device 100. At least a portion of thereceptacle mount 210 may include an electrically conductive layer 617(or the receptacle mount 210 may include an electrode) in electricalcommunication with the electrically conductive portion 605 of thesubstrate 230 and the electrically conductive terminal 616 of thereceptacle mount 210.

The electrically conductive terminal 616 may cover all or part of theinner surface 215 of the receptacle mount 210. In one embodiment, thepresence of the electrically conductive terminal 616 does not interferewith the friction fit mechanism used to attach the electricallyconductive solid phase microextraction device 600 to the emplacement104, or the use of the ejector shaft 107 to remove the electricallyconductive solid phase microextraction device 600 from the receivingdevice 100 after use.

In one embodiment, the receptacle mount is composed of an electricallyconductive polymer, is in electrical communication with the electricallyconductive portion 605 of the substrate 230, and is configured to be inelectrical communication with the emplacement 104 of the receivingdevice 100 when the electrically conductive solid phase microextractiondevice 600 is mounted to the receiving device 100.

Referring to FIG. 7 , in one embodiment, a solid phase microextractiondevice manipulator 700 (also shown in magnified detail 710) includes amanipulator shaft 103, an emplacement 104 disposed at an end of themanipulator shaft 103, the emplacement 104 being a pipettor tipemplacement 104 configured to removably engage a pipette tip receptaclemount 210 of a solid phase microextraction device 200. An electricallyconductive contact 704 is disposed at the emplacement 104 such that whenthe pipette tip receptacle mount 210 of the solid phase microextractiondevice 200 is mounted to the emplacement 104, the electricallyconductive contact 704 is in electrical communication with anelectrically conductive terminal 616 of the pipette tip receptacle mount210. An ejector 106 is configured to dismount the pipette tip receptaclemount 210 from the emplacement 104, and a clocking feature interface 406is configured to guide a clocking feature 305 of the solid phasemicroextraction device 200 into a predetermined radial orientation andfix the solid phase microextraction device 200 in the predeterminedradial orientation. The ejector 106 may be an ejector shaft 106. Theejector 106 may be composed in whole or in part of an electricallyinsulating material. Electrically insulating materials may beincorporated in various portions of the solid phase microextractiondevice manipulator 700 as needed to isolate the flow of electricity tonecessary pathways.

In one embodiment, the electrically conductive contact 704 is aconductive layer applied to the outer surface of the pipettor tipemplacement 104.

In one embodiment, the electrical circuit incorporated in the solidphase microextraction device manipulator 700 provides the electricallyconductive solid phase microextraction device 600 with voltage duringsample analysis, and includes a high voltage power supply 709 wired tothe electrically conductive contact 704 of the solid phasemicroextraction device manipulator 700. When the electrically conductivesolid phase microextraction device 600 is engaged with the pipettor tipemplacement 104, electrification of the blade portion 220 is enabled.Preferably, the presence of the electrically conductive contact 704 doesnot interfere with the friction fit mechanism used to attach theelectrically conductive solid phase microextraction device 600 to thepipettor tip emplacement 104, or the use of the ejector shaft 106 toremove the electrically conductive solid phase microextraction device600 from the receiving device 100 after use.

While the solid phase microextraction device manipulator 700 has beenmodified to enable electrification of the electrically conductive solidphase microextraction device 600, in one embodiment, all of the liquidhandling functions of the standard pipettor are maintained. This enablesthe use of a single hand tool or automation accessory to individuallyperform either basic liquid handling with standard pipette tips orCBS-related tasks. Hence, the ejector shaft 106 on the solid phasemicroextraction device manipulator 700 may be compatible with conductivetips and may be made of one or multiple layers of electricallyinsulating materials.

Simpler solid phase microextraction device manipulators 700 are alsoincluded which eliminate all of the liquid handling elements of thestandard pipettor, while maintaining the elements necessary to mount,electrify, and eject an electrically conductive solid phasemicroextraction device 600. These solid phase microextraction devicemanipulator 700 embodiments consist of a basic pipette shaft 106 with apipettor end 109 having the standardized emplacement 104, the ejectorshaft 107, and the electrically conductive contact 704. Manual useversions and robotic use versions of the simplified solid phasemicroextraction device manipulators 700 may be adapted.

Referring to FIG. 8 , in one embodiment, the solid phase microextractiondevice 200 includes a discreet electrode 816, connected to the substrate230 and located within the receptacle mount 210, and the solid phasemicroextraction device manipulator 700 includes the electricallyconductive contact 704, electrically connected to the high voltage powersupply.

Referring to FIG. 9 , in one embodiment the clocking feature 305includes slots 910 provide equidistant along the outer rim of thereceptacle mount 210. A conductive layer 616 is attached to the innersurface 215 of the receptacle mount 210. In cases where a conductivepolymer is employed for the receptacle mount 210, the conductive layer616 may be eliminated.

Referring to FIG. 10 , a magnified detail 710 of a solid phasemicroextraction device 900 is positioned to be loaded onto a solid phasemicroextraction device manipulator 1000, and the pipettor shaft 103 andemplacement 104 include protrusions 804 as the clocking featureinterface 406 for engagement with the two slots 910 as the clockingfeature 305. The protrusions 804 and slots 910 operate as a keyedmechanism to limit the position of solid phase microextraction device900 in either a 0° or 180° position with respect to solid phasemicroextraction device manipulator 700. The two-slot design depictedhere is for illustrative purposes and is not intended to be limiting.Other configurations employing more or fewer slots 910 may be used, orother features on the receptacle mount 210 may be conceived where theradial rotation of the solid phase microextraction device 900 isrestricted while engaged with the solid phase microextraction devicemanipulator 700, or the slots 910 could be disposed in the solid phasemicroextraction device manipulator 1000 and the protrusions 804 couldextend from the solid phase microextraction device 900 instead, or therecould be slots 910 and protrusions 804 for both the solid phasemicroextraction device 900 and the solid phase microextraction devicemanipulator 1000.

Referring to FIGS. 11 and 12 , in one embodiment, a solid phasemicroextraction device 1100 has three slots 910 in an asymmetricalarrangement with respect to the radial center of the receptacle mount210. This arrangement limits the radial positioning of the blade portion220. The pipettor shaft 103 and emplacement 104 have protrusions 804 asthe clocking feature interface 406 to engage with the three slots 910 ofsolid phase microextraction device 1100 as the clocking feature 305allowing for a single radial orientation of the blade portion 220.

Referring to FIG. 13(a), in one embodiment, a solid phasemicroextraction device 1300 is set at a predetermined radial orientationof the blade portion 220 with two hollow protrusions having an innersurface 1310 a and an outer surface 1310 b as the clocking feature 305.The radial position of the hollow protrusions 1310 a and 1310 bcorrespond to protrusions 804 as the clocking feature interface 406. Inthis fashion the solid phase microextraction device 1300 performs dualfunctions: (1) the inner surface 1310 a is configured for receiving theprotrusions 804; and (2) the tapered shape of the outer surface 1310 bis configured for guidance of the solid phase microextraction device1300 into a solid phase microextraction device repository 400 having aslot 410 consistent with the shape and radial arrangement of the solidphase microextraction device 1300. Electrically conductive terminal 616on the inner surface 215 of the receptacle mount 210 may provideelectrical communication between the solid phase microextraction devicemanipulator 700 and the blade portion 220. Referring to FIG. 13(b), inanother embodiment, incorporation of three hollow protrusions having aninner surface 1310 a and an outer surface 1310 b fixes the radialposition of the solid phase microextraction device 1350 to a singleposition with respect to the solid phase microextraction devicemanipulator 700.

While the foregoing specification illustrates and describes exemplaryembodiments, it will be understood by those skilled in the art thatvarious changes may be made and equivalents may be substituted forelements thereof without departing from the scope of the invention. Inaddition, many modifications may be made to adapt a particular situationor material to the teachings of the invention without departing from theessential scope thereof. Therefore, it is intended that the inventionnot be limited to the particular embodiment disclosed as the best modecontemplated for carrying out this invention, but that the inventionwill include all embodiments falling within the scope of the appendedclaims.

What is claimed is:
 1. A solid phase microextraction device, comprising:a substrate having at least one planar surface; a sorbent layer disposedon at least a portion of the at least one planar surface; amicroextraction device tip extending from the substrate; a receptaclemount configured for removable attachment to an emplacement of areceiving device, the receptacle mount being disposed distal across thesubstrate from the microextraction device tip; and a clocking featureconfigured for fixing a radial orientation of the at least one planarsurface with respect to the receiving device to a predetermined numberof radial positions.
 2. The solid phase microextraction device of claim1, wherein the clocking feature includes at least one of an indentationor a protrusion corresponding to at least one of a complimentaryprotrusion or complimentary indentation of the receiving device, suchthat when the solid phase microextraction device is mounted to thereceiving device, the clocking feature limits the radial orientation ofthe solid phase microextraction device with respect to the receivingdevice to the predetermined number of radial positions.
 3. The solidphase microextraction device of claim 1, wherein the predeterminednumber of radial positions consists of a single radial position.
 4. Thesolid phase microextraction device of claim 1, wherein the predeterminednumber of radial positions includes two distinct radial positions. 5.The solid phase microextraction device of claim 1, wherein the solidphase microextraction device includes visual indicia of the radialorientation of the at least one planar surface on the receptacle mount.6. The solid phase microextraction device of claim 1, wherein the solidphase microextraction device is a coated blade spray device.
 7. Thesolid phase microextraction device of claim 1, wherein the receptaclemount is a pipette tip receptacle mount and the emplacement is apipettor tip emplacement configured to removably engage the pipette tipreceptacle mount.
 8. The solid phase microextraction device of claim 7,wherein the receiving device is a pipettor.
 9. The solid phasemicroextraction device of claim 7, wherein the receiving device is asolid phase microextraction device manipulator.
 10. The solid phasemicroextraction device of claim 1, wherein the substrate includes anelectrically conductive portion.
 11. The solid phase microextractiondevice of claim 10, wherein the receptacle mount includes anelectrically conductive terminal configured to be in electricalcommunication with the emplacement of the receiving device when thesolid phase microextraction device is mounted to the receiving device.12. The solid phase microextraction device of claim 11, wherein at leasta portion of the receptacle mount includes an electrically conductivelayer in electrical communication with the electrically conductiveportion of the substrate and the electrically conductive terminal of thereceptacle mount.
 13. The solid phase microextraction device of claim11, wherein the receptacle mount includes an electrode in electricalcommunication with the electrically conductive portion of the substrateand the electrically conductive terminal of the receptacle mount. 14.The solid phase microextraction device of claim 10, wherein thereceptacle mount is composed of an electrically conductive polymer, isin electrical communication with the electrically conductive portion ofthe substrate, and is configured to be in electrical communication withthe emplacement of the receiving device when the solid phasemicroextraction device is mounted to the receiving device.